Arthur's Seat is the remains of a now extinct volcano which rises 250 metres (823 feet) above Holyrood Park in Edinburgh. Remains of an Iron Age Hill fort were found on the east side of the hill. The origins of the peak's name have been somewhat lost. One theory is that it is a corruption of the gaellic Ard-na-saith, meaning height of arrows, indicating a past usage as a practice place for archery. Arthur's Seat is also known as the Lion's Head.